南京北郊大气垂直扩散参数特征的测量及其应用  

Measurements and Applications of Atmospheric Vertical Dispersion Parameter Characteristics in Nanjing Northern Suburb

作　　者：曹琪敏 邹嘉南 马欣 於清源 魏夏潞 官石坚 张秀美 安俊琳[1] Cao Qimin;Zou Jia＇nan;Ma Xin;Yu Qingyuan;Wei Xialu;Guan Shijian;Zhang Xiumei;An Junlin(Key Laboratory of Meteorological Disaster,Ministry of Education（KLME）,Joint International Research Laboratory of Climate and Environment Change（ILCEC）,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science ＆ Technology,Nanjing 210044,China;College of Atmospheric Sciences,Sun Yat-sen University,Guangzhou 510275,China;Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,College of Atmospheric Sciences of Lanzhou University,Lanzhou 730000,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室,南京210044 [2]中山大学大气科学学院,广州510275 [3]兰州大学大气科学学院半干旱气候变化教育部重点实验室,兰州730000

出　　处：《气象与环境科学》2018年第4期54-59,共6页Meteorological and Environmental Sciences

基　　金：2015年度本科生气象类实验课程创新项目(SYCX201545);国家自然科学基金项目(91544229;41305135);中国科学院战略性先导科技专项(B类;XDB05020206);江苏省高校"青蓝工程"项目;江苏高校优势学科建设工程项目(PAPD);江苏省高等学校学生实践创新训练计划项目(201510300024y)资助

摘　　要：利用平面照相法,以江苏南热发电有限责任公司#Q2号烟囱为研究对象,进行了500次拍摄,通过风向风速、云量、太阳高度角等气象数据,确定了不同稳定度下南京北郊大气扩散参数的特征。与P-G扩散曲线对比发现,在强不稳定A、弱不稳定C、中性D层结中,南京北郊的大气垂直扩散参数在距离排放源200 m范围内更不稳定,而在200—1000 m范围内更稳定。其中,不稳定B层结的扩散曲线与P-G扩散曲线一致,较稳定E、稳定F层结出现于白天的频率很低。对比垂直扩散参数幂函数表达式σ_z=γx~α的系数值γ和α,本研究中α值分别比国家标准增加了28. 6%(A层结)、56. 4%(C层结)、30. 4%(D层结),而B层结的α值却比国家标准减少了22. 9%。此外,通过高斯扩散公式计算得到SO_2和NO_X扩散到观测点的浓度,发现该计算值仅占气象楼污染气体监测平台实测SO_2和NO_X浓度的0. 82%和0. 69%。结合风场发现,SO_2和NO_X实测值受观测点东部工业污染物排放的叠加效应影响较大。其中,NO_X的实测值在受到偏东风和偏南风的影响时具有较大值,且在0. 5～1. 5 m·s^(-1)的较弱风速影响时,NO_X的实测值将达到60μg·m^(-3)以上。Based on the plane photographic method, #Q2 chimney of Jiangsu south thermal power generation Co., Ltd has been observed and photographed for 500 times. The atmospheric vertical dispersion parameter characteristics under different atmospheric stability conditions in Nanjing northern suburb are determined by such meteorological data as wind direction, wind speed, cloudiness and solar altitude. In contrast to P-G diffusion curve, greater atmospheric vertical dispersion parameters can be found at 200 m than at 200 1000 m from the emission source under the stronger instability stratification A, weaker instability stratification C and neutral stratification D in Nanjing northern suburb. Diffusion curve of instability stratification B is consistent with P-G diffusion curve. Neutral stratification E and F hardly appear during the daytime. The α at the formula of atmospheric vertical dispersion parameters, σ z=γx α , at stratification A, C and D, increases by 28.6%, 56.4% and 30.4%respectively, compared with the national standards, while α at stratification B decreases by 22.9%.In addition, the calculated concentrations of SO 2 and NO X in observation point, calculated with Gaussian diffusion formulation, account only for 0.82% and 0.69% respectively of the monitored concentrations on the Emission Monitoring Systems, which are subsequently found to be influenced significantly by the additive effect of emissions in the surrounding industry areas according to the wind field. Influenced by east wind and south wind, there appears a greater value in the concentrations of NO X , and the monitored concentrations of NO X can reached more than 60 μg·m -3 at the effect of the wind at speed of 0.5 1.5 m·s -1 .

关 键 词：南京 大气扩散参数 高斯扩散模式 

分 类 号：X51[环境科学与工程—环境工程] V211[航空宇航科学与技术—航空宇航推进理论与工程]